BB

In [5]:

!pip install evince bubblebox braketlab

!pip install evince bubblebox braketlab

Requirement already satisfied: evince in /srv/conda/envs/notebook/lib/python3.9/site-packages (0.13)
Requirement already satisfied: bubblebox in /srv/conda/envs/notebook/lib/python3.9/site-packages (0.1.9)
Requirement already satisfied: braketlab in /srv/conda/envs/notebook/lib/python3.9/site-packages (0.97)
Requirement already satisfied: pythreejs in /srv/conda/envs/notebook/lib/python3.9/site-packages (from evince) (2.3.0)
Requirement already satisfied: sympy in /srv/conda/envs/notebook/lib/python3.9/site-packages (from braketlab) (1.8)
Requirement already satisfied: py3Dmol in /srv/conda/envs/notebook/lib/python3.9/site-packages (from braketlab) (1.8.0)
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Requirement already satisfied: setuptools in /srv/conda/envs/notebook/lib/python3.9/site-packages (from numba->braketlab) (57.4.0)
Requirement already satisfied: numpy>=1.15 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from numba->braketlab) (1.21.2)
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Requirement already satisfied: ipython>=4.0.0 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from ipywidgets>=7.2.1->pythreejs->evince) (7.26.0)
Requirement already satisfied: nbformat>=4.2.0 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from ipywidgets>=7.2.1->pythreejs->evince) (5.1.3)
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Requirement already satisfied: nbconvert in /srv/conda/envs/notebook/lib/python3.9/site-packages (from notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (6.1.0)
Requirement already satisfied: terminado>=0.8.3 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (0.11.1)
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Requirement already satisfied: pycparser in /srv/conda/envs/notebook/lib/python3.9/site-packages (from cffi>=1.0.0->argon2-cffi->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (2.20)
Requirement already satisfied: MarkupSafe>=2.0 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from jinja2->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (2.0.1)
Requirement already satisfied: pandocfilters>=1.4.1 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (1.4.2)
Requirement already satisfied: jupyterlab-pygments in /srv/conda/envs/notebook/lib/python3.9/site-packages (from nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (0.1.2)
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Requirement already satisfied: entrypoints>=0.2.2 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (0.3)
Requirement already satisfied: bleach in /srv/conda/envs/notebook/lib/python3.9/site-packages (from nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (4.0.0)
Requirement already satisfied: defusedxml in /srv/conda/envs/notebook/lib/python3.9/site-packages (from nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (0.7.1)
Requirement already satisfied: nbclient<0.6.0,>=0.5.0 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (0.5.4)
Requirement already satisfied: testpath in /srv/conda/envs/notebook/lib/python3.9/site-packages (from nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (0.5.0)
Requirement already satisfied: nest-asyncio in /srv/conda/envs/notebook/lib/python3.9/site-packages (from nbclient<0.6.0,>=0.5.0->nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (1.5.1)
Requirement already satisfied: packaging in /srv/conda/envs/notebook/lib/python3.9/site-packages (from bleach->nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (21.0)
Requirement already satisfied: webencodings in /srv/conda/envs/notebook/lib/python3.9/site-packages (from bleach->nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (0.5.1)
Requirement already satisfied: pyparsing>=2.0.2 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from packaging->bleach->nbconvert->notebook>=4.4.1->widgetsnbextension~=3.5.0->ipywidgets>=7.2.1->pythreejs->evince) (2.4.7)
Requirement already satisfied: mpmath>=0.19 in /srv/conda/envs/notebook/lib/python3.9/site-packages (from sympy->braketlab) (1.2.1)

In [6]:

import bubblebox as bb 
import braketlab as bl 
import evince as ev

import bubblebox as bb import braketlab as bl import evince as ev

In [7]:

import matplotlib.pyplot as plt
import numpy as np
%matplotlib notebook

ev.enable_notebook() #must be last line

import matplotlib.pyplot as plt import numpy as np %matplotlib notebook ev.enable_notebook() #must be last line

Out[7]:

In [12]:

box_1 = bb.mdbox(n100, 10, (10,10))

box_1 = bb.mdbox(n100, 10, (10,10))

ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_638/3031013055.py in <module>
----> 1 box_1 = bb.mdbox(100, 10, (10,10))

/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py in __init__(self, n_bubbles, masses, vel, size, grid, pair_list, fields)
    660         else:
    661             self.masses = masses
--> 662             self.n_bubbles = len(masses)
    663             self.set_interactions(self.masses)
    664             self.masses_inv = np.array(self.masses, dtype = float)**-1

TypeError: object of type 'int' has no len()

ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f2a8baa3910>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/

In [13]:

box_1.run()

box_1.run()

In [ ]:

help(box_1)

help(box_1)

In [18]:

while True: 
    box_1.advance()
    box_1.update_view()

while True: box_1.advance() box_1.update_view()

ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero

---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
/tmp/ipykernel_583/306884311.py in <module>
      1 while True:
----> 2     box_1.advance()
      3     box_1.update_view()

/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py in advance_vverlet(self)
    763         """
    764         if self.first_iteration:
--> 765             self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
    766             self.first_iteration = False
    767         if self.pair_list is not None:

ZeroDivisionError: division by zero

ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
IOPub data rate exceeded.
The notebook server will temporarily stop sending output
to the client in order to avoid crashing it.
To change this limit, set the config variable
`--NotebookApp.iopub_data_rate_limit`.

Current values:
NotebookApp.iopub_data_rate_limit=1000000.0 (bytes/sec)
NotebookApp.rate_limit_window=3.0 (secs)

imation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/anIOPub data rate exceeded.
The notebook server will temporarily stop sending output
to the client in order to avoid crashing it.
To change this limit, set the config variable
`--NotebookApp.iopub_data_rate_limit`.

Current values:
NotebookApp.iopub_data_rate_limit=1000000.0 (bytes/sec)
NotebookApp.rate_limit_window=3.0 (secs)

ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
IOPub data rate exceeded.
The notebook server will temporarily stop sending output
to the client in order to avoid crashing it.
To change this limit, set the config variable
`--NotebookApp.iopub_data_rate_limit`.

Current values:
NotebookApp.iopub_data_rate_limit=1000000.0 (bytes/sec)
NotebookApp.rate_limit_window=3.0 (secs)

ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
IOPub data rate exceeded.
The notebook server will temporarily stop sending output
to the client in order to avoid crashing it.
To change this limit, set the config variable
`--NotebookApp.iopub_data_rate_limit`.

Current values:
NotebookApp.iopub_data_rate_limit=1000000.0 (bytes/sec)
NotebookApp.rate_limit_window=3.0 (secs)

ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
IOPub data rate exceeded.
The notebook server will temporarily stop sending output
to the client in order to avoid crashing it.
To change this limit, set the config variable
`--NotebookApp.iopub_data_rate_limit`.

Current values:
NotebookApp.iopub_data_rate_limit=1000000.0 (bytes/sec)
NotebookApp.rate_limit_window=3.0 (secs)

ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1477, in _step
    still_going = super()._step(*args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1189, in _step
    self._draw_next_frame(framedata, self._blit)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1208, in _draw_next_frame
    self._draw_frame(framedata)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/animation.py", line 1776, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 1028, in update
    self.system.advance()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/bubblebox/mdbox.py", line 765, in advance_vverlet
    self.Fn = self.forces(self.pos, self.size2, self.interactions, r2_cut = self.r2_cut, force = self.force, pair_list = self.pair_list)
ZeroDivisionError: division by zero
ERROR:tornado.application:Exception in callback <bound method TimerBase._on_timer of <matplotlib.backends.backend_webagg_core.TimerTornado object at 0x7f60454546d0>>
Traceback (most recent call last):
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/tornado/ioloop.py", line 905, in _run
    return self.callback()
  File "/srv/conda/envs/notebook/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1216, in _on_timer
    ret = func(*args, **kwargs)
  File "/srv/

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